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5251 Aluminum vs. ASTM B685 Alloy

5251 aluminum belongs to the aluminum alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 5251 aluminum and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
120
Poisson's Ratio 0.33
0.37
Shear Modulus, GPa 26
43
Tensile Strength: Ultimate (UTS), MPa 180 to 280
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 400
180
Melting Completion (Liquidus), °C 650
1230
Melting Onset (Solidus), °C 610
1200
Specific Heat Capacity, J/kg-K 900
300
Thermal Expansion, µm/m-K 24
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
4.1

Otherwise Unclassified Properties

Density, g/cm3 2.7
11

Common Calculations

Stiffness to Weight: Axial, points 14
6.1
Stiffness to Weight: Bending, points 50
15
Strength to Weight: Axial, points 18 to 29
17 to 27
Strength to Weight: Bending, points 26 to 35
16 to 21
Thermal Shock Resistance, points 7.9 to 13
28 to 46

Alloy Composition

Aluminum (Al), % 95.5 to 98.2
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 0 to 0.15
39.5 to 40.5
Iron (Fe), % 0 to 0.5
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 1.7 to 2.4
0
Manganese (Mn), % 0.1 to 0.5
0
Palladium (Pd), % 0
59 to 60.5
Silicon (Si), % 0 to 0.4
0
Silver (Ag), % 0
0 to 0.1
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0 to 0.060
Residuals, % 0
0 to 0.2

Comparable Variants